Can't get src from iframe with beautifulSoup python

Question

I'm trying to extract video from a web page with BeautifulSoup in python but i got into some problems.

When i go to the web page and inspect to see html elements I see this tag

<iframe id="iframe-embed2" src="https://player.voxzer.org/view/1167612b04f6855ecc4bb5e0" allowfullscreen="true" webkitallowfullscreen="true" mozallowfullscreen="true" width="100%" height="auto" frameborder="0"></iframe>

and when i copy the src and open it, it shows me the video.

but when I use BeautifulSoup to find the iframe from the web page I got src as empty string.

import requests
from bs4 import BeautifulSoup

site = requests.get("the url ...")
soup = BeautifulSoup(site.text, "html.parser")
print(soup.find_all("iframe"))

>>> [<iframe allowfullscreen="true" frameborder="0" height="auto" id="iframe-embed2" mozallowfullscreen="true" scrolling="no" src="" webkitallowfullscreen="true" width="100%"></iframe>]

What is the problem here?

this question doesn't have any working solutions

Parse iframe with blank src using bs4

Answer 1

What is the problem here?

I looked at site.text and found https://player.voxzer.org/view/1167612b04f6855ecc4bb5e0 to be placed in line

mainvideos.push('https://player.voxzer.org/view/1167612b04f6855ecc4bb5e0')

as .push is JavaScript method, apparently src of this iframe is set by JavaScript code, so you will need way to execute JavaScript code of site (for example using Selenium).